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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * BQ27xxx battery monitor I2C driver
0004  *
0005  * Copyright (C) 2015 Texas Instruments Incorporated - https://www.ti.com/
0006  *  Andrew F. Davis <afd@ti.com>
0007  */
0008 
0009 #include <linux/i2c.h>
0010 #include <linux/interrupt.h>
0011 #include <linux/module.h>
0012 #include <asm/unaligned.h>
0013 
0014 #include <linux/power/bq27xxx_battery.h>
0015 
0016 static DEFINE_IDR(battery_id);
0017 static DEFINE_MUTEX(battery_mutex);
0018 
0019 static irqreturn_t bq27xxx_battery_irq_handler_thread(int irq, void *data)
0020 {
0021     struct bq27xxx_device_info *di = data;
0022 
0023     bq27xxx_battery_update(di);
0024 
0025     return IRQ_HANDLED;
0026 }
0027 
0028 static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
0029                     bool single)
0030 {
0031     struct i2c_client *client = to_i2c_client(di->dev);
0032     struct i2c_msg msg[2];
0033     u8 data[2];
0034     int ret;
0035 
0036     if (!client->adapter)
0037         return -ENODEV;
0038 
0039     msg[0].addr = client->addr;
0040     msg[0].flags = 0;
0041     msg[0].buf = &reg;
0042     msg[0].len = sizeof(reg);
0043     msg[1].addr = client->addr;
0044     msg[1].flags = I2C_M_RD;
0045     msg[1].buf = data;
0046     if (single)
0047         msg[1].len = 1;
0048     else
0049         msg[1].len = 2;
0050 
0051     ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
0052     if (ret < 0)
0053         return ret;
0054 
0055     if (!single)
0056         ret = get_unaligned_le16(data);
0057     else
0058         ret = data[0];
0059 
0060     return ret;
0061 }
0062 
0063 static int bq27xxx_battery_i2c_write(struct bq27xxx_device_info *di, u8 reg,
0064                      int value, bool single)
0065 {
0066     struct i2c_client *client = to_i2c_client(di->dev);
0067     struct i2c_msg msg;
0068     u8 data[4];
0069     int ret;
0070 
0071     if (!client->adapter)
0072         return -ENODEV;
0073 
0074     data[0] = reg;
0075     if (single) {
0076         data[1] = (u8) value;
0077         msg.len = 2;
0078     } else {
0079         put_unaligned_le16(value, &data[1]);
0080         msg.len = 3;
0081     }
0082 
0083     msg.buf = data;
0084     msg.addr = client->addr;
0085     msg.flags = 0;
0086 
0087     ret = i2c_transfer(client->adapter, &msg, 1);
0088     if (ret < 0)
0089         return ret;
0090     if (ret != 1)
0091         return -EINVAL;
0092     return 0;
0093 }
0094 
0095 static int bq27xxx_battery_i2c_bulk_read(struct bq27xxx_device_info *di, u8 reg,
0096                      u8 *data, int len)
0097 {
0098     struct i2c_client *client = to_i2c_client(di->dev);
0099     int ret;
0100 
0101     if (!client->adapter)
0102         return -ENODEV;
0103 
0104     ret = i2c_smbus_read_i2c_block_data(client, reg, len, data);
0105     if (ret < 0)
0106         return ret;
0107     if (ret != len)
0108         return -EINVAL;
0109     return 0;
0110 }
0111 
0112 static int bq27xxx_battery_i2c_bulk_write(struct bq27xxx_device_info *di,
0113                       u8 reg, u8 *data, int len)
0114 {
0115     struct i2c_client *client = to_i2c_client(di->dev);
0116     struct i2c_msg msg;
0117     u8 buf[33];
0118     int ret;
0119 
0120     if (!client->adapter)
0121         return -ENODEV;
0122 
0123     buf[0] = reg;
0124     memcpy(&buf[1], data, len);
0125 
0126     msg.buf = buf;
0127     msg.addr = client->addr;
0128     msg.flags = 0;
0129     msg.len = len + 1;
0130 
0131     ret = i2c_transfer(client->adapter, &msg, 1);
0132     if (ret < 0)
0133         return ret;
0134     if (ret != 1)
0135         return -EINVAL;
0136     return 0;
0137 }
0138 
0139 static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
0140                      const struct i2c_device_id *id)
0141 {
0142     struct bq27xxx_device_info *di;
0143     int ret;
0144     char *name;
0145     int num;
0146 
0147     /* Get new ID for the new battery device */
0148     mutex_lock(&battery_mutex);
0149     num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
0150     mutex_unlock(&battery_mutex);
0151     if (num < 0)
0152         return num;
0153 
0154     name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
0155     if (!name)
0156         goto err_mem;
0157 
0158     di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
0159     if (!di)
0160         goto err_mem;
0161 
0162     di->id = num;
0163     di->dev = &client->dev;
0164     di->chip = id->driver_data;
0165     di->name = name;
0166 
0167     di->bus.read = bq27xxx_battery_i2c_read;
0168     di->bus.write = bq27xxx_battery_i2c_write;
0169     di->bus.read_bulk = bq27xxx_battery_i2c_bulk_read;
0170     di->bus.write_bulk = bq27xxx_battery_i2c_bulk_write;
0171 
0172     ret = bq27xxx_battery_setup(di);
0173     if (ret)
0174         goto err_failed;
0175 
0176     /* Schedule a polling after about 1 min */
0177     schedule_delayed_work(&di->work, 60 * HZ);
0178 
0179     i2c_set_clientdata(client, di);
0180 
0181     if (client->irq) {
0182         ret = devm_request_threaded_irq(&client->dev, client->irq,
0183                 NULL, bq27xxx_battery_irq_handler_thread,
0184                 IRQF_ONESHOT,
0185                 di->name, di);
0186         if (ret) {
0187             dev_err(&client->dev,
0188                 "Unable to register IRQ %d error %d\n",
0189                 client->irq, ret);
0190             bq27xxx_battery_teardown(di);
0191             goto err_failed;
0192         }
0193     }
0194 
0195     return 0;
0196 
0197 err_mem:
0198     ret = -ENOMEM;
0199 
0200 err_failed:
0201     mutex_lock(&battery_mutex);
0202     idr_remove(&battery_id, num);
0203     mutex_unlock(&battery_mutex);
0204 
0205     return ret;
0206 }
0207 
0208 static int bq27xxx_battery_i2c_remove(struct i2c_client *client)
0209 {
0210     struct bq27xxx_device_info *di = i2c_get_clientdata(client);
0211 
0212     bq27xxx_battery_teardown(di);
0213 
0214     mutex_lock(&battery_mutex);
0215     idr_remove(&battery_id, di->id);
0216     mutex_unlock(&battery_mutex);
0217 
0218     return 0;
0219 }
0220 
0221 static const struct i2c_device_id bq27xxx_i2c_id_table[] = {
0222     { "bq27200", BQ27000 },
0223     { "bq27210", BQ27010 },
0224     { "bq27500", BQ2750X },
0225     { "bq27510", BQ2751X },
0226     { "bq27520", BQ2752X },
0227     { "bq27500-1", BQ27500 },
0228     { "bq27510g1", BQ27510G1 },
0229     { "bq27510g2", BQ27510G2 },
0230     { "bq27510g3", BQ27510G3 },
0231     { "bq27520g1", BQ27520G1 },
0232     { "bq27520g2", BQ27520G2 },
0233     { "bq27520g3", BQ27520G3 },
0234     { "bq27520g4", BQ27520G4 },
0235     { "bq27521", BQ27521 },
0236     { "bq27530", BQ27530 },
0237     { "bq27531", BQ27531 },
0238     { "bq27541", BQ27541 },
0239     { "bq27542", BQ27542 },
0240     { "bq27546", BQ27546 },
0241     { "bq27742", BQ27742 },
0242     { "bq27545", BQ27545 },
0243     { "bq27411", BQ27411 },
0244     { "bq27421", BQ27421 },
0245     { "bq27425", BQ27425 },
0246     { "bq27426", BQ27426 },
0247     { "bq27441", BQ27441 },
0248     { "bq27621", BQ27621 },
0249     { "bq27z561", BQ27Z561 },
0250     { "bq28z610", BQ28Z610 },
0251     { "bq34z100", BQ34Z100 },
0252     { "bq78z100", BQ78Z100 },
0253     {},
0254 };
0255 MODULE_DEVICE_TABLE(i2c, bq27xxx_i2c_id_table);
0256 
0257 #ifdef CONFIG_OF
0258 static const struct of_device_id bq27xxx_battery_i2c_of_match_table[] = {
0259     { .compatible = "ti,bq27200" },
0260     { .compatible = "ti,bq27210" },
0261     { .compatible = "ti,bq27500" },
0262     { .compatible = "ti,bq27510" },
0263     { .compatible = "ti,bq27520" },
0264     { .compatible = "ti,bq27500-1" },
0265     { .compatible = "ti,bq27510g1" },
0266     { .compatible = "ti,bq27510g2" },
0267     { .compatible = "ti,bq27510g3" },
0268     { .compatible = "ti,bq27520g1" },
0269     { .compatible = "ti,bq27520g2" },
0270     { .compatible = "ti,bq27520g3" },
0271     { .compatible = "ti,bq27520g4" },
0272     { .compatible = "ti,bq27521" },
0273     { .compatible = "ti,bq27530" },
0274     { .compatible = "ti,bq27531" },
0275     { .compatible = "ti,bq27541" },
0276     { .compatible = "ti,bq27542" },
0277     { .compatible = "ti,bq27546" },
0278     { .compatible = "ti,bq27742" },
0279     { .compatible = "ti,bq27545" },
0280     { .compatible = "ti,bq27411" },
0281     { .compatible = "ti,bq27421" },
0282     { .compatible = "ti,bq27425" },
0283     { .compatible = "ti,bq27426" },
0284     { .compatible = "ti,bq27441" },
0285     { .compatible = "ti,bq27621" },
0286     { .compatible = "ti,bq27z561" },
0287     { .compatible = "ti,bq28z610" },
0288     { .compatible = "ti,bq34z100" },
0289     { .compatible = "ti,bq78z100" },
0290     {},
0291 };
0292 MODULE_DEVICE_TABLE(of, bq27xxx_battery_i2c_of_match_table);
0293 #endif
0294 
0295 static struct i2c_driver bq27xxx_battery_i2c_driver = {
0296     .driver = {
0297         .name = "bq27xxx-battery",
0298         .of_match_table = of_match_ptr(bq27xxx_battery_i2c_of_match_table),
0299     },
0300     .probe = bq27xxx_battery_i2c_probe,
0301     .remove = bq27xxx_battery_i2c_remove,
0302     .id_table = bq27xxx_i2c_id_table,
0303 };
0304 module_i2c_driver(bq27xxx_battery_i2c_driver);
0305 
0306 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
0307 MODULE_DESCRIPTION("BQ27xxx battery monitor i2c driver");
0308 MODULE_LICENSE("GPL");
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